Microstructure and microwave absorption properties of Fe3O4/dextran/SnO2 multilayer microspheres |
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| Authors: | Yiming Wang Zhi Luo Ruoyu Hong |
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| Affiliation: | 1. Center of Micro-Nano Functional Materials and Devices, School of Energy Science and Engineering, State Key Laboratory of Electronic Thin Films and Integrated Devices, Center for Information in Biomedicine, University of Electronic Science and Technology of China, Chengdu, 611731, China;2. Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;3. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;1. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. School of Material Science and Engineering, Georgia Institute of Technology, Atlanta 30332, USA;3. Nanjing Center, China Geological Survey, Nanjing 210016, China;4. Department of Electrical and Computer Engineering, University of California Davis, Davis 95616, USA;5. Institute 53 of China North Industries Group Corporation, Jinan 250031, China;1. Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, PR China;2. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, PR China |
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| Abstract: | Fe3O4/dextran/SnO2 multilayer microspheres have been successfully designed and synthesized by solvothermal and hydrothermal reactions. Dextran worked as a linker between Fe3O4 core and SnO2 shell. It can not only prevent the oxidation of Fe3O4 but also be carbonize to another absorber carbon black. The as-synthesized microspheres were about 320 nm in size and well-defined in shape. The maximum reflection loss of Fe3O4/dextran/SnO2 microspheres and paraffin wax composites could reach 20.26 dB at 4.72 GHz, and the bandwidth with a reflection loss less than ? 10 dB was 4.86 GHz with 4 mm in thickness. The excellent microwave absorption properties of the composites were attributed to the special multilayer structures of Fe3O4/dextran/SnO2 microspheres and the effective complementarity between dielectric loss and magnetic loss. |
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